Your inspection report will list the size of the home’s electrical service. It won’t flag 100 amps as a problem, because on its own it isn’t one. Plenty of houses across Bucks and Montgomery County run on a 100-amp service without a single complaint.
The trouble shows up later. You add a heat pump, a charger in the garage, maybe a finished basement — and the number that looked fine on paper turns into the thing standing between you and your plans. It’s the one electrical fact you have to bring to the inspection yourself.
Is a 100-Amp Electrical Service a Problem?
No, not on its own. A 100-amp service is a normal size for a single-family home, and it’s enough for a house with gas heat, gas hot water, and ordinary appliances. It turns into a limitation only when the loads you plan to add total more than the service can carry.
That’s why two buyers can read the same line in the same report and reach opposite conclusions. One is keeping the house as it stands. The other intends to electrify half of it. The service didn’t change. The plans did.
What the inspector hands you is a measurement, not a verdict. The electrical system section of a standard home inspection records what’s installed and what condition it’s in, and the rating of the service is part of that record.
Why Doesn’t the Inspection Report Call It a Defect?
Because a compliant service isn’t a defect. An inspection documents what’s there and what’s wrong with it. A 100-amp service that’s properly installed and in sound condition is neither undersized nor unsafe by any standard the inspector applies. It’s simply smaller than a 200-amp service.
Buyers get tripped up here because every other electrical item in the report behaves differently. A missing ground, a double-tapped breaker, a scorched bus bar — those get written up with a recommendation attached. Capacity gets stated and left alone.
So it helps to know how findings get sorted by urgency before you reach the electrical pages, because the service rating won’t appear anywhere in the list of things to fix.
What the report does tell you
The industry standard is specific on this point. The ASHI Standard of Practice requires the inspector to describe the amperage rating of the service, which means the number lands in your report whether or not anyone points at it.
The Additions That Actually Strain a 100-Amp Service
Most of what people add to a house draws almost nothing. Lighting, a few more outlets, another television — none of that moves the needle. A short list of upgrades moves it hard.
Electric vehicle charging is the big one. A Level 2 charger runs on a 240-volt circuit and pulls steady current for hours, usually overnight. Heat pumps and electric heat strips are the other heavy hitters. After those come induction ranges and electric water heaters.
Whether your panel can absorb one of them is a calculation, not a guess. Federal guidance on home charging puts it plainly: electricians can inform homeowners whether their home has adequate electrical capacity for vehicle charging.
That calculation sits outside what a home inspection covers, which is why the answer comes from a licensed electrician rather than from your report.
You also can’t work it out by adding up the breakers already in the panel. Those numbers total far more than the service could ever deliver, because no house runs everything at once. A load calculation weights what realistically runs together, which is why the arithmetic looks nothing like the directory taped inside the door.
Open Breaker Slots Aren’t the Same as Spare Capacity
This one catches people out. Empty positions in a panel mean there’s somewhere to land a new circuit. They say nothing about whether the service feeding that panel can support what you put on it.
A full panel on a 200-amp service may have room to grow the moment a sub-panel goes in. A half-empty panel on a 100-amp service can already be near its ceiling. Counting empty slots is the easy check, and it’s rarely the one that decides anything.
Capacity and Safety Are Two Different Findings
An older home can hand you both at once, and they don’t get solved the same way. Capacity is about how much power the house can draw. Safety is about whether the wiring and equipment carrying it are sound.
A house with active knob and tube wiring has a condition worth addressing no matter how many amps come through the meter. Upgrading the service wouldn’t touch it.
The order matters when you’re budgeting. Correcting a real hazard is usually the first call. Adding capacity is a separate project with its own price, and discovering both in the same month is how buyers get caught short.
Sixty-amp services still turn up in the older housing stock around here, and that’s a different conversation entirely. At that size the constraint is concrete rather than theoretical, and it’s worth pricing the upgrade before you close instead of afterward.
If you’re weighing both at once, schedule a home inspection and ask your inspector to walk you through the panel while you’re standing in front of it.
Bring Your Plans to the Inspection
You’ll get more out of the appointment if you say out loud what you intend to do with the house. Mention the charger. Mention the heat pump. That turns a line item into a conversation while you still have time to price the work.
Ask where the spare breaker spaces are, too. A panel with open slots is easier to expand than one that’s full, and the answer takes about ten seconds. Older wiring types matter here as well, since aluminum branch wiring changes what any electrician will quote you later.
Timing matters more than people expect. Getting an electrician out to look at the panel and put a number on the work takes days, and your inspection contingency runs on a short clock. If capacity is going to shape what you offer or what you ask the seller for, start that call the same week as the inspection.
Our team has spent more than 30 years and over 15,000 inspections working in Bucks County, Montgomery County, and Philadelphia. The written report you get separates the conditions that need real attention from ordinary maintenance, and the service rating sits in there as a fact you can plan around rather than a problem you have to solve.
Frequently Asked Questions
Can you change a 100 amp panel to 200 amps?
Usually yes, though it’s a licensed electrician’s job and it often involves more than the panel itself. The service entrance cable, the meter socket, and the grounding may all need to be replaced to carry the larger service, and the utility has to be involved. Get a quote before you assume a number.
Will a home inspector tell me if my electrical service is too small?
An inspector will report the size of the service and the condition of the panel. Whether it’s too small depends entirely on what you plan to run, so share those plans during the inspection and you’ll get a far more useful answer.
Does adding an EV charger always require a panel upgrade?
Not always. Some homes have enough headroom and a spare double slot, and some chargers can be set to draw less current. A load calculation settles it, and that calculation belongs to an electrician rather than an inspector.
How do I find out what amp service a house has?
The rating is normally printed on the main breaker inside the panel and appears in the electrical section of a home inspection report. If a house is still on 60 amps, that’s worth treating as a genuine constraint rather than a footnote.
Ready to Schedule Your Inspection in Bucks, Montgomery, or Philadelphia?
Yes, if you’re under contract or close to it. A full written inspection documents the electrical service along with the rest of the house, so you’ll know what you’re working with before your contingency runs out. Contact Inspection Professionals to book a time that fits your schedule.